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Did you by chance turn on Encryption 'ON'? If not this time, maybe before sometimes? Lets say, you have encryption on and you flash your phone to a different ROM, then it will not allow you to delete the file.
Also, what File Explorer are you using? File Explorer that comes with Windows Mobile isn't very good. Using Resco File Explorer seems to solve a lot of problems related with deleting/overwriting/renaming files.
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